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Keywords:

  • diketopyrrolopyrrole;
  • organic photovoltaics;
  • organic thin-film transistors;
  • thienylenevinylene

Abstract

Thumbnail image of graphical abstract

A novel donor–acceptor-type polymer with a low band-gap that alternates electron-rich thienylenevinylene groups with electron-deficient diketopyrrolopyrrole (DPP) units (PETVTDPP) has been synthesized by Pd-catalyzed Stille cross-coupling polymerization. The polymer shows a broad absorption band of wavelengths that range from 330 to 900 nm, and a low band-gap value of 1.43 eV. The field-effect mobility of an organic thin-film transistor based on this polymer is 0.05 cm2 · Vs−1. Bulk-heterojunction solar cells using a mixture of PETVTDPP and PC[71]BM for the active layer show a power conversion efficiency (PCE) of 1.94% under simulated AM 1.5 G solar irradiation at 100 mW · cm−2.